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In the sun, suppose the value of E (energy production per second per gram) drops to 1% of its central value at r/R = .02, which can be taken as the outer boundary of the solar core. Assume E==pT^4 where p is density and T is temperature. You have this data: T(at r=0) = 16 million K and T(at r/R=0.2) = 8 million K. By what factor has the density dropped in the core from center to outer edge?
Describe the motion of a ball in a bus when the bus accelerates foward as it might be perceived by a person standing on the ground outside the bus
A 63.7-kg canoeist stands in the middle of her canoe. The canoe is 3.9 m long, and the end that is closest to land is 2.5 m from the shore. What is the canoe's mass
A 681 kg crate is lifted to the top of a building with an acceleration of 3.37 m/s2. Find the force exerted by the cable on the crate
A 2.0 mm-diameter glass bead is positively charged. The potential difference between a point 2.2 mm from the bead
A small metal ball is given a negative charge, then brought near (i.e., within a few millimetres) to end A of the rod. What happens to end A of the rod when the ball approaches it closely this first time.
The position of a 50 g oscillating mass is given by x(t) = (2.0 cm) cos(5t), where t is in seconds. Determine the following. (a) The amplitude. (b) The period. (c) The spring constant. (d) The maximum speed
A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 290 kg) that is also at rest. Determine the velocity of the second log if the lumberjack comes to rest on it
A electron emits radiation of wavelength 255 nm Calculate the maximum kinetic energy of the electron ejected, Calculate the de Broglie wavelength of the ejected electron
A stone is dropped at t = 0. A second stone, with 2 times the mass of the first, is dropped from same point at t = 190 ms. (a) How far below the release point is the center of mass of two stones at t = 390 ms? (Neither stone has yet reached the gr..
Ball bearings are made by letting spherical drops of molten metal fall inside a talll tower-called a shot tower- and solidify as they fall. What is the bearing's impact velocity
If the ball is released from rest at a height of 0.78m above the bottom of the track on the no-slip side, what is its angular speed when it is on the frictionless side of the track? suppose the ball is a solid sphere of radius 2.3cm and mass 0.14k..
A certain copper wire has a resistance of 11.0?. What is the resistance of each piece
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